US3187106A - Telephone ring-trip arrangement - Google Patents

Telephone ring-trip arrangement Download PDF

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Publication number
US3187106A
US3187106A US125231A US12523161A US3187106A US 3187106 A US3187106 A US 3187106A US 125231 A US125231 A US 125231A US 12523161 A US12523161 A US 12523161A US 3187106 A US3187106 A US 3187106A
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US
United States
Prior art keywords
ringing
current flow
circuit
station
alternating current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US125231A
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English (en)
Inventor
Steinmetz Otto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3187106A publication Critical patent/US3187106A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current

Definitions

  • the ringing voltage In order to keep the ringing current from reaching the subscribers receiver when he is holding his handset in proper call position, the ringing voltage must be quickly cut oil? as soon as the subscriber answers. This is particularly important when a subscriber answers at the start of the ringing signal, which lasts about one second. For this reason, a tripping device is included in the ringing circuit so that the ringing signal can start to be switched off when a subscriber answers during such signal.
  • the ringing circuit With the subscriber station in normal position, the ringing circuit is closed across the subscriber stations circuit. When a subscriber lifts his handset, D.C. can flow through the subscriber station. In a well-known circuit arrangement these two operating conditions are monitored and used accordingly to send or to switch off the ringing voltage.
  • the ringing circuit superimposed on the equipments supply voltage is closed across the subscribers line and includes a relay having an attenuating winding. Since there is no DC. path in the subscriber station in normal position, only a ringing voltage drop can develop at that relay when a ringing signal is sent.
  • the attenuating windings are designed to render the relay so slow-acting that it cannot respond to half cycles of the ringing voltage. In the next half cycle, the energization occurs in the opposite direction, so that the relay stays released.
  • the subscriber answers (D.C. path closed) the voltage conditions at the relay change in such a way that the energization in one direction of current predominates to a marked degree and the relay therefore responds.
  • the object of the invention is to eliminate the noted retardation drawback and to provide a circuit arrangement for cutting off the ringing circuit immediately when a subscriber answers during a non-ringing period and to also cut oil the ringing circuit immediately when the subscriber answers during a ringing period, both of these out otis being with minimum retardation.
  • This is accomplished by the circuit arrangement in accordance with the invention in that the tripping device is connected in series to two opposing rectifiers, in that this series-connected circuit is connected inparallel to a parallel circuit of a condenser and a resistance included in the ringing circuit and in that the two rectifiers are connected by their cathodes and this connection point is applied across another resistance to the equipments supply voltage.
  • the condenser-resistance snares i atented June 1, llfi5 ice parallel circuit included in the ringing circuit is so dimensioned that the potential at the parallel circuits point diverted from the ringing voltage changes approximately in phase with the potential at the ringing voltage generator.
  • the above-mentioned components comprise a circuit hereinafter termed the tripping circuit.
  • a relay R is actuated at a five-second rate, for example, to send the ringing signals.
  • the ringing circuit When that relays contact is closed, the ringing circuit is operative. Its path is: Ground, supply source B, ringing voltage generator RG, contact r1, the tripping circuit, contact rhl, line conductor L1, subscriber station S with separating capacitor and ringer, line conductor L2, contact rhZ and ground.
  • the potential proportions at the tripping circuit are as follows:
  • rectifier GrZ is conductive, and the potential of points A and B is about the same.
  • the potential is more positive as a result of the voltage drop occurring at the parallel connection of condenser C and resistance R so that rectifier Grl is blocked.
  • no current flows across tripping device Y.
  • rectifier G2 In the half cycle with increased ringing voltage in the ringing circuit, rectifier G2 is blocked since point B is at the minus potential of supply source B and point A is positive. Point A of the tripping device is always more negative than point C and point C stays more negative than point B. Thus, rectifier Grit remains blocked during this half cycle also. Thus, tripping device Y remains unoperated during the entire time of the signal when the subscriber station is in normal position.
  • Rectifier GrZ is blocked during the other half cycle.
  • the DC. path across tripping device Y, rectifier Grl and resistance R however, is maintained and relay Y remains operated.
  • the voltage drop on the subscriber line is increased by the additional ringing current for the circuit of tripping device Y and, depending on the design of the circuit arrangement, can even reach a point where an interruption of current occurs for a short time in the tripping circuit. However, thetripping action will definitely start within a cycle of the ringing A.C. voltage.
  • device Y operates contacts thereon disconnect the ringing circuit from the answering line.
  • trip means comprising a relay winding and associated
  • said blocking means including a uni-directional currentdevice which is back-biased against current flow therethrough when said called station is in an unanswered con dition and which is forward-biasedto permit current flow therethrough when said called station is in an answered condition.
  • trip means comprising a relay winding and associated current conductive bypass means, means for applying a direct current to said line through said trip means, means for periodically applying alternating current superimposed on said direct current to said line through said trip means, and blocking means associated with said trip means, said blocking means excluding direct current flow and superimposed'alternating current flow through said.
  • bypass means including a paralleled re- References Cited by theExan iner UNITED STATES PATENTS 2,189,769 2/40 Johnston et-al. 179--18' 2,421,148 5/747 'Hadfield 179 1s 2,954,438 9/60 Bray 179-18 ROBERT H. ROSE, Primary Examiner. WILLIAM C. COOPER, Examiner.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
US125231A 1960-07-21 1961-07-19 Telephone ring-trip arrangement Expired - Lifetime US3187106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST16703A DE1122585B (de) 1960-07-21 1960-07-21 Schaltungsanordnung zur Abschaltung des Rufstromes beim Melden einer Teilnehmerstelle in Fernsprechanlagen

Publications (1)

Publication Number Publication Date
US3187106A true US3187106A (en) 1965-06-01

Family

ID=7457180

Family Applications (1)

Application Number Title Priority Date Filing Date
US125231A Expired - Lifetime US3187106A (en) 1960-07-21 1961-07-19 Telephone ring-trip arrangement

Country Status (5)

Country Link
US (1) US3187106A (es)
BE (1) BE606072A (es)
CH (1) CH387107A (es)
DE (1) DE1122585B (es)
NL (1) NL267227A (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715517A (en) * 1970-03-19 1973-02-06 Ericsson Telefon Ab L M Tripping arrangement for ringing current signals in telephone exchanges
US3730999A (en) * 1971-10-26 1973-05-01 Stromberg Carlson Corp Telephone ring-trip circuit
JPS4965714A (es) * 1972-10-25 1974-06-26
US3839603A (en) * 1972-05-22 1974-10-01 Stromberg Carlson Corp Ring trip circuit employing a parallel-t filter network
US3882282A (en) * 1972-07-20 1975-05-06 Jeumont Schneider System for detecting looping of a subscriber{3 s telephone line
JPS51134506A (en) * 1975-05-16 1976-11-22 Nec Corp Subscriber's circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189769A (en) * 1938-05-04 1940-02-13 Bell Telephone Labor Inc Telephone signaling system
US2421148A (en) * 1942-06-12 1947-05-27 Automatic Elect Lab Electromagnetic relay circuit
US2954438A (en) * 1956-02-09 1960-09-27 Int Standard Electric Corp Automatic telecommunication exchange equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189769A (en) * 1938-05-04 1940-02-13 Bell Telephone Labor Inc Telephone signaling system
US2421148A (en) * 1942-06-12 1947-05-27 Automatic Elect Lab Electromagnetic relay circuit
US2954438A (en) * 1956-02-09 1960-09-27 Int Standard Electric Corp Automatic telecommunication exchange equipment

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715517A (en) * 1970-03-19 1973-02-06 Ericsson Telefon Ab L M Tripping arrangement for ringing current signals in telephone exchanges
US3730999A (en) * 1971-10-26 1973-05-01 Stromberg Carlson Corp Telephone ring-trip circuit
US3839603A (en) * 1972-05-22 1974-10-01 Stromberg Carlson Corp Ring trip circuit employing a parallel-t filter network
US3878340A (en) * 1972-05-22 1975-04-15 Stromberg Carlson Corp Ring trip circuit employing a filter network and a solid state device exhibiting electrical isolation
US3882282A (en) * 1972-07-20 1975-05-06 Jeumont Schneider System for detecting looping of a subscriber{3 s telephone line
JPS4965714A (es) * 1972-10-25 1974-06-26
JPS54724B2 (es) * 1972-10-25 1979-01-16
JPS51134506A (en) * 1975-05-16 1976-11-22 Nec Corp Subscriber's circuit
JPS5413323B2 (es) * 1975-05-16 1979-05-30

Also Published As

Publication number Publication date
BE606072A (nl) 1962-01-15
CH387107A (de) 1965-01-31
NL267227A (es)
DE1122585B (de) 1962-01-25

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